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Notations used for the vessel recovery process.
| I | Grayscale image |
| ρ 1 | Smallest radius of all the vessels |
| ρ 2 | Largest radius of all the vessels |
| ms | Median filtered I by small scale kernels |
| ml | Median filtered I by large scale kernels |
| ∇ | First order finite difference approximation to gradient operator |
| ||·|| | Euclidean distance |
| ⊕ | Morphological dilation |
| ⊖ | Morphological erosion |
| sph 1 | Spherical structural element of radius 1 |
